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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0141 Or DTC P0161: Heated Oxygen Sensor No. 2 Heater Circuit >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector. If DTC P0141 is set, measure voltage between ground and terminal No. 24 (Blue wire) at ECM harness connector E7. If DTC P0161 is set, measure voltage between ground and terminal No. 23 (Red/Black wire) at ECM harness connector E7. See Figure. Voltage should be 9-14 volts at each terminal. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.
  2. Disconnect suspect heated oxygen sensor No. 2 harness connector. Measure resistance between terminals B+ (Black/Yellow wire) and HT (Blue wire on bank No. 1; Red/Black wire on bank No. 2) at heated oxygen sensor connector (component side). See Figure. Resistance should be 11-16 ohms at 68°F (20°C). If resistance is not as specified, replace appropriate heated oxygen sensor No. 1. If resistance is as specified, go to next step.
  3. Repair wiring between ECM and appropriate heated oxygen sensor or between appropriate heated oxygen sensor and EFI main relay. See WIRING DIAGRAMS article.
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